Alternative Indicators for the Risk of Non‐response Bias: A Simulation Study

The growth of non‐response rates for social science surveys has led to increased concern about the risk of non‐response bias. Unfortunately, the non‐response rate is a poor indicator of when non‐response bias is likely to occur. We consider in this paper a set of alternative indicators. A large‐scale simulation study is used to explore how each of these indicators performs in a variety of circumstances. Although, as expected, none of the indicators fully depict the impact of non‐response in survey estimates, we discuss how they can be used when creating a plausible account of the risks for non‐response bias for a survey. We also describe an interesting characteristic of the fraction of missing information that may be helpful in diagnosing not‐missing‐at‐random mechanisms in certain situations.     

Navigating Ambivalence: Perceived Organizational Prestige–Support Discrepancy and Its Relation to Employee Cynicism and Silence

Drawing on the social identity literature, this study offers theoretical arguments and empirical evidence to understand reactions to divergent perceptions of organizational external prestige (PEP) and organizational support (POS) – two crucial bases of employees’ social worth. Across three studies, using both experimental and field data, we find that PEP‐POS discrepancy contributes to employees’ perceptions of organizational cynicism and silence behaviour, especially when PEP is high and POS is low (rather than the reverse). Consistent with our social identity perspective, we find that ambivalent identification, that is, the simultaneous identification and disidentification of an individual with an organization, is a key mediating mechanism that transfers the interactive relationship of PEP and POS to cynicism and silence. These findings contribute to a more comprehensive understanding of the dynamics of individuals’ social worth at work.     

The use of Zostavax in Spain: the economic case for vaccination of individuals aged 50 years and older

Background Population aging brings up a number of health issues, one of which is an increased incidence of herpes zoster (HZ) and its complication, post-herpetic neuralgia (PHN). Zostavax vaccine has recently become available to prevent HZ and PHN. This study evaluates the cost-effectiveness of vaccination against HZ in Spain considering a vaccination of the population aged 50 years and older and comparing this to the current situation where no vaccination is being administered.

Methods An existing, validated, and published economic model was adapted to Spain using relevant local input parameters and costs from 2013.

Results Vaccinating 30% of the Spanish population aged 50 years and older resulted in €16,577/QALY gained, €2025/HZ case avoided, and €5594/PHN case avoided under the third-party payer perspective. From a societal perspective, the ICERs increased by 6%, due to the higher price of the vaccine. The number needed to vaccinate to prevent one case was 20 for HZ, and 63 for PHN3. Sensitivity analyses showed that the model was most sensitive to the HZ and PHN epidemiological data, the health state utilities values, and vaccine price used.

Conclusion Considering an acceptable range of cost-effectiveness of €30,000–€50,000 per QALY gained, vaccination of the 50+ population in Spain against HZ with a new vaccine, Zostavax, is cost-effective and makes good use of the valuable healthcare budget.     

Health status and portfolio choice: Causality or heterogeneity?

This paper explores the role of unobserved individual characteristics in the health-assets and health-portfolio correlations. We apply various econometrics models to a unique longitudinal dataset with rich information that allows for the exploitation of four different health indices. Our findings show strong cross-sectional correlations between health and both financial and non-financial assets, but these correlations seem to be mainly driven by heterogeneity as the correlations largely disappear in the fixed-effects model. Adverse health shocks, however, are found to motivate a safer portfolio choice even after individual fixed-effects are controlled for – a result consistent with the prediction made by the background risk theory. Our findings suggest that health shocks shift investment from risky assets toward other financial assets, but keep the total financial assets unchanged.     

How strategic orientations influence the building of dynamic capability in emerging economies

Under the fierce pressures of the fast changing environments that characterize emerging economies, firms must develop dynamic capabilities to survive the competition. This study examines how strategic orientation helps build dynamic capability and its contingencies in China's emerging economy. A survey of 380 firms indicates strategic orientations are important drivers of adaptive capability, a key element of dynamic capabilities. The effectiveness of strategic orientations is contingent on market dynamics. In particular, when market demand becomes increasingly uncertain, customer orientation has a weaker impact, whereas technology orientation has a stronger effect on adaptive capability. As competition intensifies, both competitor and technology orientations build adaptive capability more effectively.     

Evaluating the urban consumer with regard to sourcing local food: a Heart of England study

This paper critically explores consumer perceptions and trends regarding purchasing locally produced food. Until recently, much of the research in this area largely focused on regional consumers where rural consumers had reasonable access to locally produced food and were usually in close proximity to the producers within, or close to, their immediate community. Here, the objectives of the primary research focused instead on urban attitudes and perceptions of local food within the Greater Birmingham conurbation in the West Midlands region of the UK. Birmingham is by far the most highly populated urban area of the region, and with ample opportunities to promote local food. Consumers, based mainly in Birmingham and Wolverhampton, were questioned on their locally produced food‐buying habits and attitudes in order to determine any differences in urban perceptions and buying attitudes compared with rural counterparts, and also to identify any new and potential opportunities for local food producers. Originally, 1000 questionnaires were obtained from across Greater Birmingham and Wolverhampton. However, for the purposes of this paper, it was decided to focus on two urban city centres – Birmingham and Wolverhampton, with 148 questionnaires. The results indicate that urban consumers are generally confused about what the term ‘local’ food means. The reasons for purchasing local food, while generally consistent with national patterns, differed in that supporting the local producers was not regarded as important. Barriers to purchase were largely unsurprising for an urban area, as the top choices were ‘too expensive’ followed by ‘not readily available’ and ‘no time to find it’. Understanding, information, availability and access to local food emerge as the biggest challenges to urban consumers in buying local food.     

Work relationships and media use: A social network analysis

Our research provided empirical evidence about the alternative means of communication used by 25 members of a research group who had available to them: unscheduled face-to-face encounters, sheduled face-to-face meetings, electronic mail, telephone, fax, and desktop videoconferencing. The intent of our research is to learn whether there are elements in existing group communication patterns that suggest how future communication systems can be designed or selected to fit the actual work relationships of a group. A detailed social network survey provided information about what members of the group communicated about, how they communicated, and with whom they communicated. Most communication was done through a combination of media, but predominately through unscheduled encounters, electronic mail, and scheduled meetings; people rarely videoconferenced, telephoned, or faxed. Factor analysis reduced the 24 work relationships to six distinct dimensions: receiving work, giving work, collaborative writing, major emotional support, sociability, and computer programming. The proportion in which the three main media were used varied according to the nature of the work dimension. Our findings suggest that a multivariate perspective that considers group norms and practices, social networks, and work dimensions is necessary to analyze media use.     

Twenty-five years of Living Under Contract: Contract farming and agrarian change in the developing world

The expansion of contract farming schemes through regions of the developing world in the era of the globalization of agriculture raises questions that are central to the study of agrarian political economy. Contract farming has extended the footprint of commodity production and integrated land and labour not otherwise captured in forms of direct production and marketing. 25 years after the publication of Living Under Contract: Contract Farming and Agrarian Transformation in Sub-Saharan Africa, a foundational collection edited by Peter Little and Michael Watts, it is necessary to take stock of the most prominent developments in the practice of contract farming and in the political economy literature studying it. The ultimate contribution of Living Under Contract was framing contract farming as expressing the unevenness of power relations in agriculture and grounding it in specific political, historical and social contexts that were not examined in the mainstream accounts. This introduction to the special issue revisits the questions that have remained relevant or re-emerged in the political economy literature on contract farming; it raises new questions that reflect contemporary developments and it explains how the papers in this collection contribute to the expansion of the theoretical and empirical horizons of the research on contemporary contract farming in low and middle-income countries.     

Heterogeneity in the Cost Structure of Water and Sanitation Services: A Cross-country Comparison of Conditions for Scale Economies

The main purpose of this article is to compare the cost structure of water utilities across a set of 14 countries with different levels of economic development. As far as is known, the cross-country perspective is novel in this literature. This article first provides new measures of returns to scale in the water and sanitation sector for a set of countries, most of them from the developing world. It is then shown that the probability of a utility operating under decreasing, constant, or increasing returns to scale depends not only on its characteristics (the volume of water produced in particular), but also on the country's level of economic development (gross national income) and business environment as measured by investor protection, the cost of enforcing contracts and perceptions of corruption.     

Training standards as a policy option? The regulation of the fitness industry

This article examines whether the regulation of service work through a ‘licence to practice’ can be effective in raising skill levels and improving the working conditions of employees. Research from the fitness industry on the impact of self‐regulation of training standards is used to explore some of the difficulties of this type of policy option.